I was thinking instead to store in the custom field a different tiddler identifier that is stable across name changes.
Could you elaborate on your use case? It would help to know why you're storing tiddler references in custom fields in the first place.
The obvious option is to use UUIDs as tiddler titles, but that of course makes linking inconvenient for users. Perhaps you could store a UUID in a custom field, so lookups later use that field instead of the title?
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